on rear cover insert above barcode
CDP
7 46001 2
DIDX 226
on disc
DIDX 226 111A6
Made in USA - Digital Audio Disc Corp (on plastic hub)
on plastic rear cover
"Patent pending" external mould raised lettering
From the excellent reference website:
http://pinkfloydarchives.com/Articles/DSOTMCDM.htm
2) Mastering Number 2 – Sony (U.S.) Mastering?
Track Peak Levels: 46.8 / 48.2 / 49.3 / 51.0 / 72.5 / 63.3 / 67.1 / 58.8 / 62.7
The very first compact disc manufacturing plant that was built in the U.S. was the Digital Audio Disc Corporation [Sony DADC] plant in Terre Haute, Indiana, which opened May 2, 1983, with commercial CD production at the plant starting in September 1984. Early copies of Dark Side of the Moon that were pressed at this plant had a unique mastering. This mastering may have been done by Sony DADC in the U.S. as this mastering is unique to these U.S. pressing. This mastering was never issued outside the U.S.
Known releases of mastering #2:
U.S. issues:
Fifth & Sixth U.S. issues - Capitol Records, catalog number CDP 7 46001 2, Silver label, DIDX-226 in the matrix, and Made in USA - Digital Audio Disc Corp. imprinted on the plastic hub.